I'm a member of the Micro/Small Model RR Layouts group on Facebook. One of the group members is a talented layout designer, and he was asked to design a track plan for a micro-layout challenge - one to fit inside a 13" x 9" football display case. After sharing his HOn30 design with the group, two of us decided to tackle building the layout, myself included. #2 turnouts, 6" radius curves, hand-laid track... "challenge" was certainly the operative word. This has turned out to be the most hobby-related fun I've had in a while! The layout is about 85% complete at this point, but I've been taking photos along the way and wanted to share the progress here. Enjoy!

This is the turntable itself. I used a small audio headphone plug to both supply power to the turntable track and act as a pivot point for the turntable. The wiring-end of the plug is what you see here.

Since the polarity would be off every 180-degrees of rotation, a switch would be needed to correct the polarity to prevent a short between the turntable and the rest of the layout. Being the sole operator of the layout, I needed it to be idiot-proof! So, I came up with the idea of a cam and a pair of roller-switches to flip the polarity automatically. Here's the cam and the plug-end of the audio connector.